Auslogics Registry Defrag 7.5.3
Auslogics Registry Defrag can significantly speed up your computer by helping you to defragment the Registry, remove gaps and make it contiguous, smaller and faster to access. The program is free of charge.

Abexo Registry Cleaner 5.3.1
Complete Registry Cleaner is a utility to make your computer run faster and smoother. By time Windows registry gathers a lot of invalid entries that cause system complications and slow down your computer significantly.

Diskeeper Server Standard Edition 9.0
Diskeeper 9 isn't just a defragmenter with a scheduling function-it is the Number One Automatic Defragmenter designed to run undetectably in the background, maximizing server speed and reliability.